I came across these on eBay https://www.ebay.co.uk/itm/N-Drive-1015-12v-DC-micro-motor/182870714017?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 Has anybody used them and what was the experience? Will they fit High Level gearboxes?   MTIA